This really is some basic Objective-C stuff. You use it for getter and setter methods. Something like this:
In header file:
Code:
@property (readwrite, assign) int _myInt;
Then inside the class file:
Code:
@synthesize _myInt;
Now you can call stuff like
Code:
MyClass *myInstance = [[MyClass alloc] init];
myInstance._myInt = 1337;
or if it's a method in the same class